Method, device and equipment for determining exhaust gas flow of EGR valve and storage medium

Abstract

The embodiment of the invention relates to a method, device and equipment for determining the exhaust gas flow of an EGR valve and a storage medium, and the method comprises the steps that the upstream basic pressure and upstream pressure drop information of the upstream of the EGR valve are obtained, and the downstream basic pressure and downstream pressure drop information of the downstream of the EGR valve are obtained; on the basis of a preset first pressure determining model, the upstream pressure of the EGR valve is determined according to the upstream basic pressure and the upstream pressure drop information; on the basis of a preset second pressure determining model, the EGR valve downstream pressure is determined according to the downstream basic pressure and the downstream pressure drop information; and according to the EGR valve upstream pressure, the EGR valve downstream pressure, the EGR valve flow area, the EGR valve flow coefficient, the EGR valve upstream exhaust gas temperature, the gas constant and the pressure ratio function of the exhaust gas flowing through the EGR valve, the EGR valve exhaust gas flow is determined. According to the embodiment of the invention, the accuracy of the exhaust gas flow of the EGR valve can be improved, and the complexity and the cost of an EGR system are reduced.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of internal combustion engine emission control, and in particular to a method, device, equipment and storage medium for determining an exhaust gas flow rate of an EGR valve. Background Art

[0002] In order to meet strict emission regulations, the engine management system of modern vehicles usually includes an EGR system to reduce combustion temperature and reduce nitrogen oxide emissions. The EGR system guides exhaust gas from the exhaust manifold to the intake manifold, usually in a higher pressure environment.

[0003] Traditional EGR systems use differential pressure sensors to measure the EGR valve upstream pressure, EGR valve downstream pressure and EGR valve front and rear pressure difference to calculate the EGR valve exhaust gas flow. However, the differential pressure sensor is easily contaminated, which can affect the accuracy, thus affecting the accuracy of the EGR valve exhaust gas flow and increasing the complexity and cost of the EGR system. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the embodiments of the present disclosure provide a method, device, equipment and storage medium for determining the exhaust gas flow rate of an EGR valve.

[0005] A first aspect of an embodiment of the present disclosure provides a method for determining an exhaust gas flow rate of an EGR valve, the method comprising:

[0006] Obtaining upstream basic pressure and upstream pressure drop information upstream of the EGR valve, and obtaining downstream basic pressure and downstream pressure drop information downstream of the EGR valve, wherein the upstream basic pressure is the basis for calculating the total pressure drop upstream of the EGR valve, and the upstream pressure drop information is used to characterize various pressure losses from the position corresponding to the upstream basic pressure to the EGR valve inlet, and the downstream basic pressure is the basis for calculating the total pressure drop downstream of the EGR valve, and the downstream pressure drop information is used to characterize various pressure losses from the EGR valve outlet to the position corresponding to the upstream basic pressure;

[0007] Determine the EGR valve upstream pressure based on the preset first pressure determination model and according to the upstream base pressure and the upstream pressure drop information;

[0008] Determine the pressure downstream of the EGR valve based on the downstream base pressure and the downstream pressure drop information based on a preset second pressure determination model;

[0009] The exhaust gas flow rate of the EGR valve is determined based on the EGR valve upstream pressure, EGR valve downstream pressure, EGR valve flow area, EGR valve flow coefficient, EGR valve upstream exhaust gas temperature, gas constant, and pressure ratio function of the exhaust gas flowing through the EGR valve.

[0010] A second aspect of an embodiment of the present disclosure provides a device for determining an exhaust gas flow rate of an EGR valve, the device comprising:

[0011] A first acquisition module is used to acquire upstream basic pressure and upstream pressure drop information upstream of the EGR valve, and to acquire downstream basic pressure and downstream pressure drop information downstream of the EGR valve, wherein the upstream basic pressure is the basis for calculating the total pressure drop upstream of the EGR valve, and the upstream pressure drop information is used to characterize various pressure losses from the position corresponding to the upstream basic pressure to the EGR valve inlet, and the downstream basic pressure is the basis for calculating the total pressure drop downstream of the EGR valve, and the downstream pressure drop information is used to characterize various pressure losses from the EGR valve outlet to the position corresponding to the upstream basic pressure;

[0012] A first determination module, configured to determine the EGR valve upstream pressure based on a preset first pressure determination model and according to the upstream basic pressure and the upstream pressure drop information;

[0013] a second determination module, configured to determine the pressure downstream of the EGR valve based on a preset second pressure determination model and according to the downstream basic pressure and the downstream pressure drop information;

[0014] The third determination module is used to determine the exhaust gas flow rate of the EGR valve according to the EGR valve upstream pressure, the EGR valve downstream pressure, the EGR valve flow area, the EGR valve flow coefficient, the exhaust gas temperature upstream of the EGR valve, the gas constant, and the pressure ratio function of the exhaust gas flowing through the EGR valve.

[0015] A third aspect of an embodiment of the present disclosure provides an electronic device, the server comprising: a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the method of the first aspect above.

[0016] A fourth aspect of an embodiment of the present disclosure provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the method of the first aspect described above can be implemented.

[0017] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0018] The disclosed embodiment can obtain the upstream basic pressure, the upstream pressure drop information, the downstream basic pressure and the downstream pressure drop information, and then determine the EGR valve upstream pressure and the EGR valve downstream pressure based on the first pressure determination model and the first pressure determination model according to the above four items, instead of using a differential pressure sensor to measure the EGR valve upstream pressure and the EGR valve downstream pressure as in the related art. In this way, the influence of pollution on the accuracy of the EGR valve upstream pressure and the EGR valve downstream pressure can be avoided, thereby improving the accuracy of the EGR valve exhaust flow rate, and since the differential pressure sensor can be omitted, the complexity and cost of the EGR system are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 is a structural schematic diagram of an engine equipped with an EGR system provided by an embodiment of the present disclosure;

[0022] Figure 2 is a relationship diagram between a pressure ratio and a pressure ratio function provided by an embodiment of the present disclosure;

[0023] Figure 3 is a flow chart of a method for determining an exhaust gas flow rate of an EGR valve provided by an embodiment of the present disclosure;

[0024] Figure 4 is a structural schematic diagram of another engine equipped with an EGR system provided by an embodiment of the present disclosure;

[0025] Figure 5 is a structural schematic diagram of another engine equipped with an EGR system provided by an embodiment of the present disclosure;

[0026] Figure 6 is a schematic diagram of a second association relationship corresponding to a rotation speed of 6000 rpm provided by an embodiment of the present disclosure;

[0027] Figure 7 is a schematic diagram of a second correlation relationship corresponding to a rotation speed of 5000 rpm provided by an embodiment of the present disclosure;

[0028] Figure 8is a schematic diagram of a second correlation relationship corresponding to a rotation speed of 4000 rpm provided by an embodiment of the present disclosure;

[0029] Fig. 9 is a schematic diagram of a second correlation relationship corresponding to a rotation speed of 3000 rpm provided by an embodiment of the present disclosure;

[0030] Fig.10 is a schematic diagram of a second correlation relationship corresponding to a rotation speed of 2000 rpm provided by an embodiment of the present disclosure;

[0031] Fig.11 is a schematic diagram of a second association relationship corresponding to a rotation speed of 1000 rpm provided by an embodiment of the present disclosure;

[0032] Fig.12 is an EGR valve upstream pressure deviation distribution provided by an embodiment of the present disclosure;

[0033] Fig.13 is an EGR valve downstream pressure deviation distribution provided by an embodiment of the present disclosure;

[0034] Fig.14 is a schematic diagram of a monitoring result of EGR dif% based on a pressure sensor provided in an embodiment of the present disclosure;

[0035] Fig.15 is a schematic diagram of a monitoring result of EGR dif% based on a first pressure determination model and a second pressure determination model provided by an embodiment of the present disclosure;

[0036] Fig.16 It is a structural schematic diagram of a device for determining the exhaust gas flow rate of an EGR valve provided by an embodiment of the present disclosure;

[0037] Fig.17 It is a structural schematic diagram of an electronic device in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0040] Figure 1 Schematic diagram of the structure of an engine equipped with an EGR system provided by an embodiment of the present disclosure. Figure 1 As shown, the engine includes an Air Filter 1, a MAF&T&RH 2, an ETC 3, a TMAP 4, an intake manifold 5, a TWC 6, a GPF 7, a Muffler 8, an EGR valve 9, an exhaust gas temperature sensor 10, an EGR cooler 11 and a differential pressure sensor 12, wherein the differential pressure sensor 12 is used to measure the pressure upstream of the EGR valve, the pressure downstream of the EGR valve and the differential pressure before and after the EGR valve, and then calculate the exhaust gas flow of the EGR valve.

[0041] Figure 2 It is a relationship diagram between a pressure ratio and a pressure ratio function provided by an embodiment of the present disclosure. Figure 2 The horizontal axis is the pressure ratio (pDs / pUs), and the vertical axis is the pressure ratio function. In actual working conditions, most of the working conditions of the EGR system are in the area with a relatively large pressure ratio. Figure 2 It can be seen that the greater the pressure ratio, the greater the change in the pressure ratio function, that is, the more sensitive the calculated EGR valve exhaust gas flow is. Therefore, there are high requirements for the accuracy of the EGR valve upstream pressure and the EGR valve downstream pressure. In related technologies, the monitoring of the EGR valve upstream pressure and the EGR valve downstream pressure usually relies on a differential pressure sensor, which is easily affected by contamination. The inaccuracy of the differential pressure sensor will affect the accuracy of the EGR valve exhaust gas flow, and then affect the EGR system control, thereby affecting the engine performance and the ability to meet emission requirements. In addition, the setting of the differential pressure sensor increases the complexity and cost of the EGR system.

[0042] In view of this, the embodiments of the present disclosure provide a method, device, equipment and storage medium for determining the exhaust flow rate of an EGR valve. The method for determining the exhaust flow rate of an EGR valve is first described in detail below.

[0043] Figure 3 1 is a flow chart of a method for determining an exhaust gas flow rate of an EGR valve provided by an embodiment of the present disclosure. The method can be executed by an electronic device. The electronic device can be exemplarily understood as an ECU or other device in a vehicle. Figure 3 As shown, the method provided in this embodiment includes the following steps:

[0044] S310. Obtain the upstream basic pressure and upstream pressure drop information upstream of the EGR valve, and obtain the downstream basic pressure and downstream pressure drop information downstream of the EGR valve, wherein the upstream basic pressure is the basis for calculating the total pressure drop upstream of the EGR valve, and the upstream pressure drop information is used to characterize the various pressure losses from the position corresponding to the upstream basic pressure to the EGR valve inlet, and the downstream basic pressure is the basis for calculating the total pressure drop downstream of the EGR valve, and the downstream pressure drop information is used to characterize the various pressure losses from the EGR valve outlet to the position corresponding to the upstream basic pressure.

[0045] Specifically, from the "position corresponding to the upstream base pressure" to the "EGR valve inlet", the path includes at least one component, and the upstream base pressure is the basis or reference for calculating the pressure loss of each component on the path. The upstream pressure drop information is used to characterize the pressure loss of each component on the path. It should be noted that the "pressure loss of the component" mentioned here refers to the sum of the "pressure loss of the component itself" and the "pressure loss on the pipeline between the component and the adjacent component".

[0046] In some embodiments, the upstream base pressure may include ambient pressure, and the upstream pressure drop information may include a muffler pressure drop and an EGR cooler pressure drop.

[0047] Specifically, the ambient pressure can be measured by a first pressure sensor. The first pressure sensor can be any sensor capable of measuring ambient pressure, which is not limited here. For example, a pressure sensor for measuring ambient pressure is usually provided in the ECU, and the pressure sensor can be used as the first pressure sensor, but is not limited thereto.

[0048] For example, Figure 4 FIG. 1 is a schematic diagram of another engine structure provided with an EGR system according to an embodiment of the present disclosure. Figure 4 As shown, the engine includes Air Filter (i.e., air filter) 1, MAF&T&RH2, ETC3, TMAP4, intake manifold 5, TWC6, Muffler (i.e., muffler) 8, EGR valve 9, exhaust gas temperature sensor 10, and EGR cooler 11. Among them, AirFilter 1 is used to filter the air entering the engine; MAF&T&RH2 is used to measure the air quality, air temperature, and relative humidity entering the engine; ETC3 is used to control the amount of air entering the engine; TMAP4 is used to measure the intake temperature and intake manifold pressure; TWC6 is used to reduce harmful substances in the exhaust gas, such as carbon monoxide and nitrogen oxides, and convert them into harmless gases through chemical reactions; Muffler 8 is used to absorb and reduce exhaust noise to make the vehicle run quieter; EGR valve 9 is used to reintroduce part of the exhaust gas into the intake manifold; the exhaust gas temperature sensor 10 is used to measure the exhaust gas temperature upstream of the EGR valve; and the EGR cooler 11 is used to cool the recirculated exhaust gas. Correspondingly, the upstream base pressure can be the ambient pressure. The path from the external environment to the EGR valve inlet includes Muffler 8 and EGR cooler 11. Therefore, the upstream pressure drop information includes the muffler pressure drop and the EGR cooler pressure drop, wherein the muffler pressure drop is the sum of the "pressure loss of the muffler 8 itself" and the "pressure loss in the pipeline between the muffler 8 and the EGR cooler 11"; the EGR cooler pressure drop is the sum of the "pressure loss of the EGR cooler 11 itself" and the "pressure loss in the pipeline between the EGR cooler 11 and the EGR valve 9".

[0049] In other embodiments, the engine equipped with the EGR system includes a GPF. In this case, the upstream base pressure may include the GPF upstream pressure, and the upstream pressure drop information may include the EGR cooler pressure drop.

[0050] Specifically, the GPF upstream pressure can be measured by a second pressure sensor, wherein the second pressure sensor can be any sensor capable of measuring the GPF upstream pressure, which is not limited here.

[0051] For example, Figure 5 FIG. 1 is a schematic diagram of another engine structure provided by an embodiment of the present disclosure and equipped with an EGR system. Figure 4 and Figure 5 The difference of the engine shown is that the EGR system includes GPF7 and a second pressure sensor 13, wherein the second pressure sensor 13 can be used to measure the GPF upstream pressure, the GPF downstream pressure and the GPF front-rear pressure difference. Accordingly, the upstream base pressure can be the GPF upstream pressure, and the path from GPF7 to the EGR valve inlet includes the EGR cooler 11, so the upstream pressure drop information can include the EGR cooler pressure drop, wherein the EGR cooler pressure drop can be the sum of "the pressure loss of the EGR cooler 11 itself", "the pressure loss on the pipeline between the EGR cooler 11 and the GPF7" and "the pressure loss on the pipeline between the EGR cooler 11 and the EGR valve 9".

[0052] Specifically, from the "position corresponding to the downstream base pressure" to the "EGR valve outlet", the path includes at least one section of pipeline and / or at least one component, and the downstream base pressure is the basis or reference for calculating the pressure loss of each section of pipeline and / or each component in the path. The downstream pressure drop information is used to characterize the pressure loss of each section of pipeline and / or each component in the path. It should be noted that the "pressure loss of the component" mentioned here refers to the "pressure loss of the component itself".

[0053] In some embodiments, the downstream base pressure may include an intake manifold pressure, and the downstream pressure drop information may include a gas line pressure loss.

[0054] For example, see Figure 4 and Figure 5 The downstream base pressure may be the intake manifold pressure. The path from the intake manifold to the EGR valve outlet includes a section of pipeline, so the downstream pressure drop information includes the gas line pipeline pressure loss, wherein the gas line pipeline pressure loss is the pressure loss of the pipeline between the intake manifold and the EGR valve outlet.

[0055] S320 : Determine the EGR valve upstream pressure based on a preset first pressure determination model and according to the upstream basic pressure and the upstream pressure drop information.

[0056] In some embodiments, the upstream base pressure includes the ambient pressure, and the upstream pressure drop information includes the muffler pressure drop and the EGR cooler pressure drop; wherein S320 includes: based on the first pressure determination model, the ambient pressure and the muffler pressure drop are added, and then the EGR cooler pressure drop is subtracted to obtain the EGR valve upstream pressure.

[0057] Specifically, the ambient pressure, the muffler pressure drop, and the EGR cooler pressure drop are input into the first pressure determination model, and the first pressure determination model can calculate the EGR valve upstream pressure by the following formula (2):

[0058] EGR valve upstream pressure = ambient pressure + muffler pressure drop - EGR cooler pressure drop formula (2)

[0059] In other embodiments, the upstream base pressure includes the GPF upstream pressure, and the upstream pressure drop information includes the EGR cooler pressure drop; wherein S320 includes: based on the first pressure determination model, subtracting the EGR cooler pressure drop from the GPF upstream pressure to obtain the EGR valve upstream pressure.

[0060] Specifically, the GPF upstream pressure and the EGR cooler pressure drop are input into the first pressure determination model, and the first pressure determination model can calculate the EGR valve upstream pressure by the following formula (3):

[0061] EGR valve upstream pressure = GPF upstream pressure - EGR cooler pressure drop formula (3)

[0062] It can be understood that by calculating the EGR valve upstream pressure using the above formula (2) or formula (3), the actual pressure distribution upstream of the EGR valve in the EGR system can be more comprehensively reflected, thereby obtaining an EGR valve upstream pressure that is closer to the actual situation. This is conducive to improving the accuracy of the EGR valve upstream pressure.

[0063] S330 : Determine the EGR valve downstream pressure based on a preset second pressure determination model and according to the downstream basic pressure and the downstream pressure drop information.

[0064] In some embodiments, the downstream base pressure includes the intake manifold pressure, and the downstream pressure drop information includes the air line pressure loss; wherein S330 includes: based on the second pressure determination model, adding the intake manifold pressure and the air line pressure loss to obtain the EGR valve downstream pressure.

[0065] Specifically, the intake manifold pressure and the gas line pressure loss are input into the second pressure determination model, and the second pressure determination model can calculate the EGR valve downstream pressure by the following formula (4):

[0066] EGR valve downstream pressure = intake manifold pressure + gas line pressure loss formula (4)

[0067] It can be understood that the calculation of the EGR valve downstream pressure by the above formula (4) can more comprehensively reflect the actual pressure distribution downstream of the EGR valve in the EGR system, thereby obtaining an EGR valve downstream pressure that is closer to the actual situation. This is conducive to improving the accuracy of the EGR valve downstream pressure.

[0068] S340, determining the exhaust gas flow rate of the EGR valve according to the EGR valve upstream pressure, the EGR valve downstream pressure, the EGR valve flow area, the EGR valve flow coefficient, the exhaust gas temperature upstream of the EGR valve, the gas constant, and the pressure ratio function of the exhaust gas flowing through the EGR valve.

[0069] Specifically, the EGR valve exhaust gas flow rate is calculated by the following formula (5):

[0070]

[0071] Where m is the exhaust gas flow rate of the EGR valve, A is the flow area of ​​the EGR valve, C d is the EGR valve flow coefficient, p in is the pressure upstream of the EGR valve, T in is the exhaust gas temperature upstream of the EGR valve, R is the gas constant, and p out is the pressure downstream of the EGR valve, It is a function of the pressure ratio of the exhaust gas flowing through the EGR valve.

[0072] The disclosed embodiment can obtain the upstream basic pressure, the upstream pressure drop information, the downstream basic pressure and the downstream pressure drop information, and then determine the EGR valve upstream pressure and the EGR valve downstream pressure based on the first pressure determination model and the first pressure determination model according to the above four items, instead of using a differential pressure sensor to measure the EGR valve upstream pressure and the EGR valve downstream pressure as in the related art. In this way, the influence of pollution on the accuracy of the EGR valve upstream pressure and the EGR valve downstream pressure can be avoided, thereby improving the accuracy of the EGR valve exhaust flow rate, and since the differential pressure sensor can be omitted, the complexity and cost of the EGR system are reduced.

[0073] Based on the above technical solution, optionally, obtaining the muffler pressure drop in the upstream pressure drop information includes: obtaining the speed and load of the engine;

[0074] The muffler pressure drop corresponding to the engine speed and load is determined by querying the pre-calibrated first correlation relationship, wherein the first correlation relationship is the correspondence between the speed, the load and the muffler pressure drop.

[0075] Specifically, considering that the muffler pressure drop is related to the exhaust gas flow rate, the larger the exhaust gas flow rate, the greater the pressure loss, and there is a close relationship between the exhaust gas flow rate and the engine operating condition, therefore, the muffler pressure drop corresponding to various engine operating conditions can be calibrated in advance, thereby obtaining the corresponding relationship between the muffler pressure drop and the engine operating condition.

[0076] Furthermore, considering that the engine operating condition usually refers to the running state of the engine under specific conditions, and these conditions are mainly defined by the engine speed and load, it is possible to cover all engine operating conditions according to the speed and load, and calibrate the muffler pressure drop under different operating conditions, thereby obtaining the first correlation relationship. Specifically, the operating point is first determined, that is, the speed range: from idle to maximum speed, and the load range: from no load to full load need to be determined. The speed can be divided into several intervals, and different load levels are further divided within each interval. In this way, a series of operating points can be obtained, each of which represents a specific combination of speed and load. Then, for each operating point, the engine is adjusted to the specified speed and load, and the muffler pressure drop is measured using an appropriate pressure sensor. But it is not limited to this.

[0077] Specifically, in the process of determining the exhaust gas flow of the EGR valve, the engine speed and load can be obtained, and by querying the first association relationship, the muffler pressure drop corresponding to the speed and load can be found, and then the muffler pressure drop is substituted into formula (2) to calculate the EGR valve upstream pressure, and then the EGR valve upstream pressure is substituted into formula (5) to calculate the EGR valve exhaust gas flow.

[0078] It can be understood that by querying the pre-calibrated first correlation and finding the muffler pressure drop corresponding to the speed and load, the estimated muffler pressure drop can be closer to the actual muffler pressure drop, thereby making the subsequently calculated EGR valve upstream pressure more accurate, thereby improving the accuracy of the EGR valve exhaust flow.

[0079] On the basis of the above technical solution, optionally, obtaining the EGR cooler pressure drop in the upstream pressure drop information includes: obtaining the exhaust gas temperature upstream of the EGR valve, the speed and load of the engine;

[0080] Determine a target second correlation relationship corresponding to the exhaust gas temperature upstream of the EGR valve from a plurality of pre-calibrated second correlation relationships, wherein the second correlation relationship is a correspondence relationship among the speed, the load, and the pressure drop of the EGR cooler, and different second correlation relationships correspond to different exhaust gas temperatures upstream of the EGR valve;

[0081] By querying the target second association relationship, the EGR cooler pressure drop corresponding to the engine speed and load is determined.

[0082] Specifically, considering that the EGR cooler pressure drop is related to the exhaust gas flow rate, the larger the exhaust gas flow rate, the greater the pressure loss, and there is a close relationship between the exhaust gas flow rate and the engine operating condition, and the EGR cooler pressure drop is also related to the exhaust gas temperature (such as the exhaust gas temperature upstream of the EGR valve, etc.), therefore, the EGR cooler pressure drop corresponding to various engine operating conditions can be pre-calibrated at each temperature point, so as to obtain the corresponding relationship between the EGR cooler pressure drop and the engine operating condition at each temperature point.

[0083] Furthermore, at each temperature point (such as the exhaust gas temperature upstream of the EGR valve, etc.): all engine operating conditions can be covered according to the speed and load, and the EGR cooler pressure drop under different operating conditions can be calibrated to obtain the second correlation relationship corresponding to the temperature point. Specifically, the exhaust gas temperature range is first determined, and the exhaust gas temperature can be divided into several intervals, and the second correlation relationship corresponding to the temperature interval is calibrated at each temperature interval (i.e., temperature point). Exemplarily, the calibration process of the second correlation relationship is as follows: First, the operating point is determined, that is, the speed range needs to be determined: from idle to maximum speed, and the load range: from no load to full load. The speed can be divided into several intervals, and different load levels are further divided within each interval. In this way, a series of operating points can be obtained, each of which represents a specific speed and load combination. Then, for each operating point, the engine is adjusted to the specified speed, load and temperature point, and the EGR cooler pressure drop is measured using an appropriate pressure sensor. But it is not limited to this.

[0084] Specifically, in the process of determining the exhaust gas flow rate of the EGR valve, the exhaust gas temperature upstream of the EGR valve, the engine speed and load can be obtained, and the target second association relationship corresponding to the exhaust gas temperature upstream of the EGR valve can be determined. By querying the target second association relationship, the EGR cooler pressure drop corresponding to the speed and load is found, and then the EGR cooler pressure drop is substituted into formula (2) or formula (3) to calculate the EGR valve upstream pressure, and then the EGR valve upstream pressure is substituted into formula (5) to calculate the EGR valve exhaust gas flow rate.

[0085] It can be understood that by looking up the target second association relationship corresponding to the exhaust gas temperature upstream of the EGR valve, and then querying the target second association relationship, the EGR cooler pressure drop corresponding to the speed and load is found, which can make the estimated EGR cooler pressure drop closer to the actual EGR cooler pressure drop, thereby making the subsequently calculated EGR valve upstream pressure more accurate, thereby improving the accuracy of the EGR valve exhaust flow rate.

[0086] On the basis of the above technical solution, optionally, obtaining the gas line pressure loss in the downstream pressure drop information includes: obtaining the engine speed and the EGR valve intake flow rate;

[0087] Determine a target third correlation relationship corresponding to the engine speed from a plurality of pre-calibrated third correlation relationships, wherein the third correlation relationship is a correspondence between an EGR valve intake flow rate and a gas line pressure loss, and different third correlation relationships correspond to different engine speeds;

[0088] By querying the target third association relationship, the air line pressure loss corresponding to the EGR valve intake flow is determined.

[0089] Specifically, according to the pressure loss characteristics of the fluid flowing in the pipeline, the pressure loss is related to the flow rate and flow velocity through the pipeline. Therefore, a correlation relationship related to the engine speed and the intake flow rate through the EGR valve (i.e., the EGR valve intake flow rate) is constructed. Specifically, it is necessary to determine the speed range: from idle to maximum speed. According to the speed range, a series of speed points can be obtained, and the third correlation relationship corresponding to the speed point is calibrated at each speed point. Exemplarily, the calibration process of the third correlation relationship corresponding to a certain speed point is as follows: adjust the engine to the speed, and use an appropriate pressure sensor to measure the air line pressure loss at each EGR valve intake flow rate. But it is not limited to this.

[0090] For example, Figure 6 It is a schematic diagram of a second correlation relationship corresponding to a rotation speed of 6000 rpm provided in an embodiment of the present disclosure. Figure 7 It is a schematic diagram of a second correlation relationship corresponding to a rotation speed of 5000 rpm provided in an embodiment of the present disclosure. Figure 8 It is a schematic diagram of a second correlation relationship corresponding to a rotation speed of 4000 rpm provided in an embodiment of the present disclosure. Fig. 9 It is a schematic diagram of a second correlation relationship corresponding to a rotation speed of 3000 rpm provided in an embodiment of the present disclosure.

[0091] Fig.10 It is a schematic diagram of a second correlation relationship corresponding to a rotation speed of 2000 rpm provided in an embodiment of the present disclosure. Fig.11 is a schematic diagram of a second correlation relationship corresponding to a rotation speed of 1000 rpm provided by an embodiment of the present disclosure. Figure 6-11 As shown, the horizontal axis is the pressure loss of the gas pipeline, that is, the pressure downstream of the EGR valve - the intake manifold pressure, and the vertical axis is the intake flow of the EGR valve. Figure 6-11 It is the pressure loss of the gas pipeline at different flow rates flowing through the EGR valve at different speeds.

[0092] Specifically, in the process of determining the exhaust gas flow of the EGR valve, the engine speed and the EGR valve intake flow can be obtained to determine the target third association relationship corresponding to the engine speed, and by querying the target third association relationship, the air line pipeline pressure loss corresponding to the EGR valve intake flow is found, and then the air line pipeline pressure loss is substituted into formula (4) to calculate the EGR valve downstream pressure, and then the EGR valve downstream pressure is substituted into formula (5) to calculate the EGR valve exhaust gas flow.

[0093] It can be understood that by looking up the target third association corresponding to the engine speed, and then querying the target third association, the air pipeline pressure loss corresponding to the EGR valve intake flow is found, which can make the estimated air pipeline pressure loss closer to the actual air pipeline pressure loss, and thus make the subsequently calculated EGR valve downstream pressure more accurate, thereby improving the accuracy of the EGR valve exhaust flow.

[0094] In summary, the disclosed embodiment accurately estimates the upstream and downstream pressures of the EGR valve through software modeling, so that after eliminating the EGR differential pressure sensor, the estimated upstream and downstream pressures of the EGR valve are within an acceptable range, thereby achieving the purpose of reducing costs and increasing efficiency. The measurement pressure deviation of the existing EGR differential pressure sensor is about ±1kpa. For example, Fig.12 An EGR valve upstream pressure deviation distribution is provided in an embodiment of the present disclosure. Fig.13 is a pressure deviation distribution of the downstream of the EGR valve provided by the embodiment of the present disclosure. Fig.12 and Fig.13 As shown, the embodiment of the present disclosure can control the upstream and downstream pressure deviation of the EGR valve within ±1kPa through actual measurement, and can meet the calculation accuracy requirement of EGR through engine bench steady-state and vehicle dynamic verification. Fig.14 It is a schematic diagram of the monitoring result of EGR dif% based on a pressure sensor provided in an embodiment of the present disclosure. Fig.15 FIG. 1 is a schematic diagram of the monitoring results of EGR dif% based on the first pressure determination model and the second pressure determination model provided by the embodiment of the present disclosure. Fig.14 and Fig.15 As shown in the figure, the experiment compares the two schemes of "obtaining the upstream and downstream pressures of the EGR valve through the EGR pressure difference sensor" and "calculating the upstream and downstream pressures of the EGR valve through the model". There is no obvious difference in the EGR deviation, and almost the same calculation accuracy is achieved, which can meet the accuracy requirements of the test bench and the whole vehicle model.

[0095] Fig.16 1 is a schematic diagram of a structure of an EGR valve exhaust flow determination device provided by an embodiment of the present disclosure. The EGR valve exhaust flow determination device can be understood as the above-mentioned electronic device or a part of the functional modules in the above-mentioned electronic device. Fig.16 As shown, the EGR valve exhaust flow rate determining device 1600 includes:

[0096] A first acquisition module 1610 is used to acquire upstream basic pressure and upstream pressure drop information upstream of the EGR valve, and to acquire downstream basic pressure and downstream pressure drop information downstream of the EGR valve, wherein the upstream basic pressure is the basis for calculating the total pressure drop upstream of the EGR valve, and the upstream pressure drop information is used to characterize various pressure losses from the position corresponding to the upstream basic pressure to the EGR valve inlet, and the downstream basic pressure is the basis for calculating the total pressure drop downstream of the EGR valve, and the downstream pressure drop information is used to characterize various pressure losses from the EGR valve outlet to the position corresponding to the upstream basic pressure;

[0097] A first determination module 1620, configured to determine the EGR valve upstream pressure based on a preset first pressure determination model and according to the upstream basic pressure and the upstream pressure drop information;

[0098] A second determination module 1630, configured to determine the EGR valve downstream pressure based on a preset second pressure determination model and according to the downstream basic pressure and the downstream pressure drop information;

[0099] The third determination module 1640 is used to determine the EGR valve exhaust flow rate based on the EGR valve upstream pressure, the EGR valve downstream pressure, the EGR valve flow area, the EGR valve flow coefficient, the EGR valve upstream exhaust temperature, the gas constant, and the pressure ratio function of the exhaust gas flowing through the EGR valve.

[0100] Optionally, the upstream base pressure includes an ambient pressure measured by a first pressure sensor, and the upstream pressure drop information includes a muffler pressure drop and an EGR cooler pressure drop;

[0101] The first determination module 1620 is specifically used to determine the EGR valve upstream pressure by adding the ambient pressure and the muffler pressure drop and then subtracting the EGR cooler pressure drop based on the first pressure determination model.

[0102] Optionally, the upstream base pressure includes a GPF upstream pressure measured by a second pressure sensor, and the upstream pressure drop information includes an EGR cooler pressure drop;

[0103] The first determination module 1620 is specifically configured to obtain the EGR valve upstream pressure by subtracting the EGR cooler pressure drop from the GPF upstream pressure based on the first pressure determination model.

[0104] Optionally, the first acquisition module 1610 includes a first acquisition submodule, which is used to acquire the muffler pressure drop in the upstream pressure drop information, wherein the first acquisition submodule is specifically used to acquire the speed and load of the engine;

[0105] The muffler pressure drop corresponding to the speed and load of the engine is determined by querying a pre-calibrated first correlation relationship, wherein the first correlation relationship is a correspondence between the speed, the load and the muffler pressure drop.

[0106] Optionally, the first acquisition module 1610 includes a second acquisition submodule, which is used to acquire the EGR cooler pressure drop in the upstream pressure drop information, wherein the second acquisition submodule is specifically used to acquire the exhaust gas temperature upstream of the EGR valve, the speed and load of the engine;

[0107] Determining a target second correlation relationship corresponding to the exhaust gas temperature upstream of the EGR valve from a plurality of pre-calibrated second correlation relationships, wherein the second correlation relationship is a correspondence relationship among the speed, the load, and the pressure drop of the EGR cooler, and different second correlation relationships correspond to different exhaust gas temperatures upstream of the EGR valve;

[0108] By querying the target second association relationship, the EGR cooler pressure drop corresponding to the speed and load of the engine is determined.

[0109] Optionally, the downstream base pressure includes intake manifold pressure, and the downstream pressure drop information includes air line pressure loss;

[0110] The second determination module 1630 is specifically configured to add the intake manifold pressure and the gas line pressure loss based on the second pressure determination model to obtain the EGR valve downstream pressure.

[0111] Optionally, the second acquisition module includes a third acquisition submodule, the third acquisition submodule is used to obtain the gas line pressure loss in the downstream pressure drop information, and the third acquisition submodule is specifically used to obtain the engine speed and the EGR valve intake flow rate;

[0112] Determining a target third correlation relationship corresponding to the engine speed from a plurality of pre-calibrated third correlation relationships, wherein the third correlation relationship is a correspondence between an EGR valve intake flow rate and a gas line pressure loss, and different third correlation relationships correspond to different engine speeds;

[0113] The air line pressure loss corresponding to the EGR valve intake flow is determined by querying the target third association relationship.

[0114] The device provided in this embodiment can execute the method of any of the above embodiments, and its execution method and beneficial effects are similar, which will not be repeated here.

[0115] An embodiment of the present disclosure further provides an electronic device, which includes: a memory, in which a computer program is stored; and a processor, for executing the computer program. When the computer program is executed by the processor, the method of any of the above embodiments can be implemented.

[0116] For example, Fig.17 Schematic diagram of the structure of an electronic device in the embodiment of the present disclosure. Fig.17 , which shows a schematic diagram of the structure of an electronic device 1700 suitable for implementing the embodiment of the present disclosure. The electronic device 1700 in the embodiment of the present disclosure may include, but is not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Fig.17 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0117] like Fig.17 As shown, the electronic device 1700 may include a processing device (e.g., a central processing unit, a graphics processor, etc.) 1701, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1702 or a program loaded from a storage device 1708 to a random access memory (RAM) 1703. In the RAM 1703, various programs and data required for the operation of the electronic device 1700 are also stored. The processing device 1701, the ROM 1702, and the RAM 1703 are connected to each other via a bus 1704. An input / output (I / O) interface 1705 is also connected to the bus 1704.

[0118] Typically, the following devices may be connected to the I / O interface 1705: an input device 1706 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 1707 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 1708 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1709. The communication device 1709 may allow the electronic device 1700 to communicate with other devices wirelessly or by wire to exchange data. Although Fig.17 The electronic device 1700 is shown with various devices, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead.

[0119] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a non-transitory computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device 1709, or installed from a storage device 1708, or installed from a ROM 1702. When the computer program is executed by the processing device 1701, the above-mentioned functions defined in the method of the embodiment of the present disclosure are executed.

[0120] It should be noted that the computer-readable medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0121] In some embodiments, the client and the server may communicate using any known or future developed network protocol such as HTTP (HyperText Transfer Protocol), and may be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), an internet (e.g., the Internet), and a peer-to-peer network (e.g., an ad hoc peer-to-peer network), as well as any known or future developed network.

[0122] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0123] The computer-readable medium carries one or more programs. When the one or more programs are executed by the electronic device, the electronic device: obtains upstream basic pressure and upstream pressure drop information upstream of the EGR valve, and obtains downstream basic pressure and downstream pressure drop information downstream of the EGR valve, wherein the upstream basic pressure is the basis for calculating the total pressure drop upstream of the EGR valve, and the upstream pressure drop information is used to characterize various pressure losses from the position corresponding to the upstream basic pressure to the EGR valve inlet, and the downstream basic pressure is the basis for calculating the total pressure drop downstream of the EGR valve, and the downstream pressure drop information is used to characterize various pressure losses from the EGR valve outlet to the position corresponding to the upstream basic pressure;

[0124] Determine the EGR valve upstream pressure based on the preset first pressure determination model and according to the upstream base pressure and the upstream pressure drop information;

[0125] Determine the pressure downstream of the EGR valve based on the downstream base pressure and the downstream pressure drop information based on a preset second pressure determination model;

[0126] The exhaust gas flow rate of the EGR valve is determined based on the EGR valve upstream pressure, the EGR valve downstream pressure, the EGR valve flow area, the EGR valve flow coefficient, the exhaust gas temperature upstream of the EGR valve, and the pressure ratio function of the exhaust gas flowing through the EGR valve.

[0127] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages ​​or a combination thereof, including, but not limited to, object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0128] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0129] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit does not, in some cases, limit the unit itself.

[0130] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0131] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0132] The embodiments of the present disclosure further provide a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the method of any of the above embodiments can be implemented. The execution method and beneficial effects are similar and will not be repeated here.

[0133] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0134] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for determining the exhaust gas flow rate of an EGR valve, characterized in that: include: Acquire the upstream basic pressure and upstream pressure drop information upstream of the EGR valve, and acquire the downstream basic pressure and downstream pressure drop information downstream of the EGR valve, wherein the upstream basic pressure is the basis for calculating the total pressure drop upstream of the EGR valve, and the upstream pressure drop information is used to characterize the various pressure losses from the position corresponding to the upstream basic pressure to the EGR valve inlet, and the downstream basic pressure is the basis for calculating the total pressure drop downstream of the EGR valve, and the downstream pressure drop information is used to characterize the various pressure losses from the EGR valve outlet to the position corresponding to the upstream basic pressure; Determine the EGR valve upstream pressure based on the upstream base pressure and the upstream pressure drop information based on a preset first pressure determination model; Determine the pressure downstream of the EGR valve based on the downstream base pressure and the downstream pressure drop information based on a preset second pressure determination model; The exhaust gas flow rate of the EGR valve is determined according to the EGR valve upstream pressure, the EGR valve downstream pressure, the EGR valve flow area, the EGR valve flow coefficient, the exhaust gas temperature upstream of the EGR valve, the gas constant, and the pressure ratio function of the exhaust gas flowing through the EGR valve.

2. The method according to claim 1, characterized in that The upstream base pressure includes the ambient pressure measured by the first pressure sensor, and the upstream pressure drop information includes the muffler pressure drop and the EGR cooler pressure drop; Wherein, the determining the EGR valve upstream pressure based on the preset first pressure determination model according to the upstream base pressure and the upstream pressure drop information includes: Based on the first pressure determination model, the ambient pressure and the muffler pressure drop are added together, and then the EGR cooler pressure drop is subtracted to obtain the EGR valve upstream pressure.

3. The method according to claim 1, characterized in that The upstream base pressure includes the GPF upstream pressure measured by the second pressure sensor, and the upstream pressure drop information includes the EGR cooler pressure drop; Wherein, the determining the EGR valve upstream pressure based on the preset first pressure determination model according to the upstream base pressure and the upstream pressure drop information includes: Based on the first pressure determination model, the EGR valve upstream pressure is obtained by subtracting the EGR cooler pressure drop from the GPF upstream pressure.

4. The method according to claim 2, characterized in that: Acquiring the muffler pressure drop in the upstream pressure drop information includes: Get the engine speed and load; The muffler pressure drop corresponding to the speed and load of the engine is determined by querying a pre-calibrated first correlation relationship, wherein the first correlation relationship is a correspondence between the speed, the load and the muffler pressure drop.

5. The method according to claim 2 or 3, characterized in that: Acquiring the EGR cooler pressure drop in the upstream pressure drop information includes: Obtaining the exhaust gas temperature upstream of the EGR valve, the speed and load of the engine; Determining a target second correlation relationship corresponding to the exhaust gas temperature upstream of the EGR valve from a plurality of pre-calibrated second correlation relationships, wherein the second correlation relationship is a correspondence relationship among the speed, the load, and the pressure drop of the EGR cooler, and different second correlation relationships correspond to different exhaust gas temperatures upstream of the EGR valve; By querying the target second association relationship, the EGR cooler pressure drop corresponding to the speed and load of the engine is determined.

6. The method according to claim 1, characterized in that The downstream base pressure includes the intake manifold pressure, and the downstream pressure drop information includes the gas line pressure loss; Wherein, the determining the pressure downstream of the EGR valve based on the preset second pressure determination model according to the downstream base pressure and the downstream pressure drop information includes: Based on the second pressure determination model, the intake manifold pressure and the gas line pressure loss are added to obtain the EGR valve downstream pressure.

7. The method according to claim 6, characterized in that Obtaining the gas pipeline pressure loss in the downstream pressure drop information includes: Obtain the engine speed and EGR valve intake flow; Determining a target third correlation relationship corresponding to the engine speed from a plurality of pre-calibrated third correlation relationships, wherein the third correlation relationship is a correspondence between an EGR valve intake flow rate and a gas line pressure loss, and different third correlation relationships correspond to different engine speeds; The air line pressure loss corresponding to the EGR valve intake flow is determined by querying the target third association relationship.

8. A device for determining the exhaust gas flow rate of an EGR valve, characterized in that: include: A first acquisition module is used to acquire upstream basic pressure and upstream pressure drop information upstream of the EGR valve, and to acquire downstream basic pressure and downstream pressure drop information downstream of the EGR valve, wherein the upstream basic pressure is the basis for calculating the total pressure drop upstream of the EGR valve, and the upstream pressure drop information is used to characterize various pressure losses from the position corresponding to the upstream basic pressure to the EGR valve inlet, and the downstream basic pressure is the basis for calculating the total pressure drop downstream of the EGR valve, and the downstream pressure drop information is used to characterize various pressure losses from the EGR valve outlet to the position corresponding to the upstream basic pressure; a first determination module, configured to determine the EGR valve upstream pressure based on a preset first pressure determination model and according to the upstream basic pressure and the upstream pressure drop information; a second determination module, configured to determine the EGR valve downstream pressure based on a preset second pressure determination model and according to the downstream basic pressure and the downstream pressure drop information; The third determination module is used to determine the EGR valve exhaust flow rate based on the EGR valve upstream pressure, the EGR valve downstream pressure, the EGR valve flow area, the EGR valve flow coefficient, the EGR valve upstream exhaust gas temperature, the gas constant, and the pressure ratio function of the exhaust gas flowing through the EGR valve.

9. An electronic device, characterized in that: include: A processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

Images